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Graphite-coated metal particle-containing silicon nanosheet fast-charging negative electrode material, method and battery

A metal particle, silicon nanosheet technology, applied in metal material coating process, nanotechnology, nanotechnology and other directions, can solve the problems of volume expansion, easy crushing, unstable material interface, etc., to maintain integrity, simple process, The effect of improving cycle stability

Active Publication Date: 2022-03-15
海宁硅泰科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, during the rapid charge and discharge process of the existing lithium-ion battery, the silicon material has volume expansion and is easily crushed, which leads to instability of the material interface, loss of active materials, rapid decline in electrode capacity, and poor conductivity of the silicon material. The lithium ion battery prepared by the negative electrode material of the present invention can effectively solve the above problems

Method used

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  • Graphite-coated metal particle-containing silicon nanosheet fast-charging negative electrode material, method and battery
  • Graphite-coated metal particle-containing silicon nanosheet fast-charging negative electrode material, method and battery
  • Graphite-coated metal particle-containing silicon nanosheet fast-charging negative electrode material, method and battery

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Dissolve 10g of anhydrous nickel chloride in 100ml of ethanol, weigh 1g of CaSi 2 , 2g ascorbic acid and 1g sodium borohydride. Put all the raw materials into the reactor and react at 80°C without pressure for 5h. Next, the pressure of the reactor was set to 20 MPa, and the temperature was set to 200° C., and the reaction was continued for 1 hour under these conditions to obtain a precipitate A. The precipitate A was washed several times with ethanol and then freeze-dried at -60°C to obtain nickel-containing silicon nanosheets. The nickel-containing silicon nanosheets were heat-treated at 700°C for 1 hour under the protection of argon, followed by acetylene gas for 20 minutes, and then heated to 950°C for 2 hours under the protection of argon to obtain graphite-coated nickel-containing silicon nanosheets for fast charging.

Embodiment 2

[0032] Dissolve 10g of anhydrous cobalt chloride in 100ml of ethanol, weigh 1g of CaSi 2 and 2 g sodium borohydride. Put all the raw materials into the reactor and react at 15MPa and 40°C for 2h. Next, the pressure of the reactor was set to 40 MPa, and the temperature was set to 150° C., and the reaction was continued for 0.5 h under these conditions to obtain silicon nanosheets. The silicon nanosheets were washed several times with ethanol and then freeze-dried at -80°C to obtain cobalt-containing silicon nanosheets. Cobalt-containing silicon nanosheets were heat-treated at 650°C for 1.5 hours under the protection of argon, followed by acetylene gas for 15 minutes, and then heated to 950°C for 2 hours under the protection of argon to obtain graphite-coated cobalt-containing silicon nanosheets for fast charging. Material.

Embodiment 3

[0034] Dissolve 5g of anhydrous nickel chloride and 5g of anhydrous cobalt chloride in 100ml of ethanol, weigh 1g of CaSi 2 and 2 g sodium borohydride. Put all the raw materials into the reactor and react at 80°C without pressure for 5h. Next, the pressure of the reactor was set to 20 MPa, and the temperature was set to 200° C., and the reaction was continued for 1 hour under these conditions to obtain a precipitate A. Precipitate A was washed several times with ethanol and then freeze-dried at -80°C to obtain silicon nanosheets containing nickel and cobalt. Silicon nanosheets containing nickel and cobalt were heat-treated at 750°C for 2 hours under the protection of argon, followed by methane gas for 30 minutes, and then heated to 1000°C for 3 hours under the protection of argon to obtain graphite-coated silicon nanosheets containing nickel and cobalt Fast charge negative electrode material.

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Abstract

The invention discloses a graphite-coated metal particle-containing silicon nanosheet fast-charging negative electrode material, a method and a battery. The preparation method comprises the following steps: mixing calcium silicide and a reducing agent in an anhydrous metal chloride solution to form slurry, and fully reacting the slurry under a stirring condition to obtain a precipitate A; cleaning the precipitate A, and freeze-drying to obtain a metal particle-containing silicon nanosheet; and sequentially carrying out chemical vapor deposition and heat treatment on the metal particle-containing silicon nanosheet to obtain the graphite-coated metal particle-containing silicon nanosheet fast-charging negative electrode material. The process is simple, the silicon nanosheet can be prepared without strict anaerobic conditions, and the method is suitable for industrial production. The lithium ion battery prepared from the material has the advantages of good quick charge performance, high stability, excellent rate capability and the like.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a graphite-coated metal particle-containing silicon nanosheet fast-charging negative electrode material, a method and a battery. Background technique [0002] Two-dimensional nanomaterials such as graphene, perovskite, silicene, and transition metal sulfur compounds are used as anode materials for lithium-ion batteries, which can not only inhibit the structural changes of the material during charge and discharge, but also facilitate the rapid adsorption and migration of lithium ions. Provide enough space, so it has a wide application prospect in the field of lithium-ion batteries. According to existing literature reports, the theoretical specific capacity of silicon nanosheets is 3579mAh / g, and the working voltage is lower than 0.5V, which is an ideal negative electrode material. At present, the preparation methods of silicon nanosheets are mainly chemical vapor de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/021C23C16/26C23C16/44C23C16/56C01B32/205B82Y30/00B82Y40/00H01M4/38H01M4/36H01M4/62H01M10/0525
CPCC01B33/021C23C16/4417C23C16/26C23C16/56C01B32/205B82Y30/00B82Y40/00H01M4/625H01M4/364H01M4/386H01M10/0525Y02E60/10
Inventor 汪雷陈静祝洪良
Owner 海宁硅泰科技有限公司
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